sometimes I am replacing an existing movie with a version in better quality. At least I want to replace them. The extensions are sometimes different so FileBot won‘t show me an exclamation that the movie already exists. But it would be a smart function if there would be an indicator if the target directory already exists or FileBot will have to create it.

In my case, if the directory already exists, I can remove the old version of the movie.

Yeah, but if FileBot would just show if the directory already exists this would be working as well. All movies are placed in its own directory (Plex style), so if the directory already exists there is also another version of the movie in it. So there is no need for duplicate checking, only checking the directory a movie is moved to.

The duplicates script could also be an option, I believe it matches with extended attrs, not file names, so it would likely flag duplicates if both files were processed using FileBot even with different extensions/quality.